CAJ | 학술논문

于2011年在定西地区开展了观测试验，主要测定了不同水分控制条件下春小麦冠层高光谱反射特征，同步测定了各项生理参数响应。在分析不同水分胁迫下春小麦冠层光谱特征基础上，研究了该地区春小麦冠层光谱对不同水分胁迫的响应特征。结果表明：在水分胁迫下春小麦冠层光谱在可见光区(VIS)和近红外区(NIR)均呈现明显的趋势性变化，随水分减少， VIS光区与短波红外光区(SWIR)反射率都呈增加趋势，而NIR光区反射率呈下降趋势；小麦水分指标冠层等效水厚度(EWTcanopy)比叶片相对含水量(FMC)能够更敏感地体现水分胁迫变化；光谱指数对不同水分胁迫的响应分析表明， WI指数的监测效果较差；反演半干旱区冠层尺度作物水分，红边植被指数与EW Tcanopy相关性最高， P RI指数可反映作物水分胁迫后的光合效率变化，间接反映水分状况，但不适合监测重旱； OSAV I 对土壤调节系数的修订比SAV I 提高了相关性；短波红外波段对水分胁迫的变化响应比较稳定，进一步结合红边波段构建新的水分指数有望提高研究区冠层水分的监测精度。
우2011년재정서지구개전료관측시험，주요측정료불동수분공제조건하춘소맥관층고광보반사특정，동보측정료각항생리삼수향응。재분석불동수분협박하춘소맥관층광보특정기출상，연구료해지구춘소맥관층광보대불동수분협박적향응특정。결과표명：재수분협박하춘소맥관층광보재가견광구(VIS)화근홍외구(NIR)균정현명현적추세성변화，수수분감소， VIS광구여단파홍외광구(SWIR)반사솔도정증가추세，이NIR광구반사솔정하강추세；소맥수분지표관층등효수후도(EWTcanopy)비협편상대함수량(FMC)능구경민감지체현수분협박변화；광보지수대불동수분협박적향응분석표명， WI지수적감측효과교차；반연반간한구관층척도작물수분，홍변식피지수여EW Tcanopy상관성최고， P RI지수가반영작물수분협박후적광합효솔변화，간접반영수분상황，단불괄합감측중한； OSAV I 대토양조절계수적수정비SAV I 제고료상관성；단파홍외파단대수분협박적변화향응비교은정，진일보결합홍변파단구건신적수분지수유망제고연구구관층수분적감측정도。
The canopy reflectance in different water stresses was measured at the semi-arid agriculture and meteorological station in Dingxi in 2011, and also were measured the biochemistry parameters with the ASD Field Spec spectroradiometer. This work was mainly to analyze the response characteristics for canopy hyperspectral reflectance in different water stresses. The results indicated that the reflectance value in VIS and SWIR increased and the value in NIR decreased with the water stress being from a light to a severe level. The relative water content (FMC) and equivalent water thickness (EWT) were analyzed and the EWT-canopy could indicate that the water changed better than FMC. Eight spectral indices were selected and the relationship between every index and water content was analyzed. Water Index (W I) was not in a good relation to EW T-canopy, and the vegetation indices based on the red edges of NDV I and REP had good relationships with the crop water content defined with EW T-canopy, as well as with the OSAV I and SAV I. And the P RI could bring about the changes of photosynthesis and show the water status indirectly, but it could well show a light instead of a severe drought in the study area. The wave band in SWIR was responed stably with the EW T-canopy and the new index that combined the red edge and SWIR might improve the precision for drought monitoring.